Katerina Swanson
The Boeing 737 is a twin-engine narrow-body aircraft that has been in production since 1997. It has a fuel capacity that varies depending on the model, with some models having greater ranges than others. The fuel consumption of a Boeing 737 is estimated at about 746.27 gallons of fuel per hour, or 12.44 gallons per minute. The 737-800, for example, was the first US commercial flight to use a blend of algae-derived biofuel and traditional jet fuel, reducing its carbon footprint.
| Characteristics | Values |
|---|---|
| Fuel consumption | 746.27 gallons per hour or 12.44 gallons per minute |
| Fuel capacity | Greater than the 737 Classic |
| Range | 2,000 nautical miles (3,700 km; 2,300 mi) |
| Auxiliary fuel tanks | Up to two in the cargo hold |
| First flight using biofuel | United Airlines flight from Houston to Chicago in 2011 |
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What You'll Learn
Fuel capacity varies across 737 models
The fuel capacity of the Boeing 737 varies depending on the model and flight conditions. The Boeing 737 Next Generation (737NG) series, for example, has greater fuel capacity than the 737 Classic series. Within the 737NG series, different variants have different fuel capacities.
The 737-900ER (Extended Range) is the largest variant of the 737NG line and offers improved range compared to other variants. It can be equipped with up to two auxiliary fuel tanks in the cargo hold, allowing it to match the range of other 737NG variants.
The 737-900, another member of the 737NG family, retains the same fuel capacity as the -800 variant. This trade-off between range and payload results in a slightly reduced range compared to other variants.
The Boeing Business Jet (BBJ), also known as the BBJ1, is based on the dimensions of the 737-700 but includes additional features such as stronger wings and landing gear from the 737-800. The BBJ2, based on the 737-800, offers increased cabin and baggage space but has a slightly reduced range. Both the BBJ1 and BBJ2 are equipped with auxiliary fuel tanks, contributing to their extended range capabilities.
The P-8 Poseidon, a maritime patrol aircraft based on the 737-800ER, features stronger wings from the -900 variant and raked wingtips, enhancing its performance in specific operational roles. While the fuel capacity for the P-8 is not explicitly mentioned, its modified design suggests tailored fuel configurations to suit its specialised functions.
While exact fuel capacities vary across different 737 models, a commonly cited estimate for fuel usage is approximately 5,000 pounds or 746.27 gallons per hour, translating to approximately 12.44 gallons per minute. These estimates can vary based on flight conditions and operational settings, such as cruising altitude and takeoff.
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Fuel efficiency depends on flight conditions
The fuel efficiency of an aircraft depends on several factors, including its weight, aerodynamics, engine efficiency, and flight conditions. The Boeing 737 is a narrow-body aircraft with a fuel capacity of up to 23,900 kg, depending on the variant. Here's how flight conditions can impact its fuel efficiency:
Altitude and Air Pressure
An aircraft's optimum cruising altitude increases as its weight decreases during flight due to fuel burn. Flying at higher altitudes can reduce pressure, which can be mitigated by installing a turbocharger in a piston engine. Higher altitudes also decrease temperature, increasing thermal efficiency.
Speed and Endurance
Endurance and range can be maximized by flying at the optimum airspeed. Flying slower can reduce fuel consumption and emissions, as demonstrated by Scandinavian Airlines when they reduced their cruising speed to save fuel and curb carbon dioxide emissions.
Route and Distance
The efficiency of a flight can depend on its route and distance. Short-haul flights tend to be less fuel-efficient because more fuel is required for takeoff and landing relative to the cruise segment. For long-haul flights, stopping halfway to refuel can be more efficient than carrying all the necessary fuel, despite the energy losses during descent and climb.
Aircraft Design and Materials
The design and materials used in an aircraft can impact its weight and aerodynamics, affecting fuel efficiency. Using lightweight materials such as titanium, carbon fiber, and composite plastics can reduce weight and improve aerodynamics, leading to better fuel efficiency.
Engine Technology and Maintenance
Advanced engine technology and maintenance can also influence fuel efficiency. The Airbus A320neo, for example, offers improved fuel burn and lower engine wear, making it more efficient on medium-range flights. The Boeing 737 MAX, on the other hand, has better aerodynamics and excels in long-range operations.
In summary, the fuel efficiency of the Boeing 737 depends on various flight conditions and operational factors. These include cruising altitude, speed, route, distance, aircraft design, engine technology, and maintenance practices, all of which can be optimized to improve overall fuel efficiency.
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The 737-800 used biofuel
The 737-800 is a popular aircraft used by several airlines, including Ryanair, Southwest Airlines, and United Airlines. It is the most widely used narrow-body aircraft and the best-selling 737NG variant. The 737NG series has a greater fuel capacity than the 737 Classic, with a redesigned wing with a larger area, a wider wingspan, and higher maximum takeoff weights (MTOW).
In 2011, a United Airlines 737-800 aircraft operated the first U.S. commercial flight powered by a blend of algae-derived biofuel and traditional jet fuel. This flight was from Houston to Chicago and was undertaken to reduce the aircraft's carbon footprint. The 737-800 burns 850 US gallons (3,200 litres) of jet fuel per hour, which is approximately 80% of the fuel used by an MD-80 on a comparable flight.
The 737-800 has a payload capacity of 52,800 pounds (23,900 kg) and a range of 2,000 nautical miles (3,700 km; 2,300 mi). The introduction of Split Scimitar winglets in 2014 further increased the fuel efficiency of the 737-800, producing up to a 5.5% fuel saving per aircraft compared to the 3.3% savings of the blended winglets.
The 737-800 is a popular choice for airlines due to its fuel efficiency, range, and payload capacity. It offers a typical 2-class cabin layout for 160 passengers, with a cruising speed of 880 km/hr at 9150 m.
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The BBJ2 has auxiliary fuel tanks
The Boeing 737 is a twin-engine narrow-body aircraft that has been in production since 1997. The 737 Next Generation series has seen several variants, including the BBJ2, which was launched in 1999.
The BBJ2 is based on the 737-800 and offers 25% more cabin space and twice the baggage capacity of the BBJ1. It also has auxiliary fuel tanks in the cargo hold and winglets, although its range is slightly reduced. The BBJ2's auxiliary fuel tanks can be configured to meet specific needs, with some models featuring up to five auxiliary tanks. The number of tanks and their placement can impact the balance and cargo hold utilization of the aircraft.
The BBJ2's fuel capacity and range are important considerations for owners and operators. The decision to install additional tanks depends on the typical mission range and the frequency of longer-range flights. While a greater fuel capacity can enable the aircraft to reach more distant destinations, it also comes with increased maintenance and inspection costs. Therefore, it is essential to balance the benefits of extended range with the potential added expenses.
The BBJ2's auxiliary fuel tanks are part of the aircraft's modification to serve the private, head of state, and corporate jet market. The BBJ brand has since expanded to include configurations based on other Boeing models, such as the 737 MAX, 777, and 787 Dreamliner, showcasing the versatility and adaptability of the original 737 design.
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The 737-900ER has two auxiliary fuel tanks
The 737-900ER is the final and largest variant of the Boeing 737 NG line. It was introduced to fill the range and passenger capacity gap in Boeing's offerings after the 757-200 was discontinued. The 737-900ER can hold up to two auxiliary fuel tanks in the cargo hold, which increases its range compared to other 737NG variants. The aircraft also features standard winglets, an additional pair of exit doors, and a flat rear pressure bulkhead, allowing for a maximum seating capacity of 220 passengers.
The 737-900ER was launched in July 2005 and first flew in September 2006. It was designed to address the shortcomings of its predecessor, the 737-900, and to compete directly with the Airbus A321. The addition of auxiliary fuel tanks and standard winglets improved the range of the 737-900ER, making it comparable to other 737NG variants.
The 737-900ER's auxiliary fuel tanks are located in the cargo hold and can be activated or deactivated as needed. When activated, these tanks provide additional fuel capacity, increasing the aircraft's range and endurance. This flexibility allows operators to optimise the aircraft's performance based on the specific requirements of each flight.
The exact fuel capacity of the 737-900ER, including the auxiliary fuel tanks, can vary depending on various factors, such as the configuration of the aircraft and the number of active tanks. However, according to some sources, the 737-900ER can carry up to 962 gallons of auxiliary fuel.
The ability to utilise auxiliary fuel tanks gives the 737-900ER extended range capabilities, making it suitable for longer flights and routes that may not be feasible for other aircraft in its class. This flexibility in range and passenger capacity has contributed to the popularity of the 737-900ER among airlines and leasing companies.
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Frequently asked questions
The fuel capacity of a 737 varies depending on the model. The 737-900ER, for example, has increased range capabilities due to its auxiliary fuel tanks, while the BBJ3 has a slightly shorter range than other variants. The 737NG has greater fuel capacity than the 737 Classic, and the 737-800ER has stronger wings than other variants, which may impact fuel capacity.
A Boeing 737 typically consumes around 746.27 gallons of fuel per hour, or approximately 12.44 gallons per minute. This can vary depending on the model and flight conditions, such as cruising altitude or takeoff.
The fuel efficiency of a 737 can vary widely depending on how the aircraft is operated during different phases of flight. For example, a 737 will consume more fuel during takeoff than during cruising. Additionally, the number of passengers on board does not significantly impact fuel efficiency, as most of the energy is used to combat air resistance.
